What’s Vulnerable › Vulnerabilities

CVE-2023-54264: fs/sysv: Null check to prevent null-ptr-deref bug

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: fs/sysv: Null check to prevent null-ptr-deref bug sb_getblk(inode->i_sb, parent) return a null ptr and taking lock on that leads to the null-ptr-deref bug.

Affected products

• Linux kernel: 2.6.19 — fixed in 6.5

How to fix

Upgrade to a fixed version: Linux kernel 6.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0a44ceba77c3267f8505dda102a59367dc24caee
• https://git.kernel.org/stable/c/1416eebaad80bdc85ad9f97f27242011b031e2a9
• https://git.kernel.org/stable/c/7f740bc696d4617f8ee44565e8ac0d36278a1e91
• https://git.kernel.org/stable/c/afd9a31b5aa4b3747f382d44a7b03b7b5d0b7635
• https://git.kernel.org/stable/c/baa60c66a310c50785289b0ede6fdce8ec3219c7
• https://git.kernel.org/stable/c/e28f376dd8dfcc4e880ac101184132bc08703f6e
• https://git.kernel.org/stable/c/e976988bc245ec3768cc0f76bed7d05488a7dd0f
• https://git.kernel.org/stable/c/ea2b62f305893992156a798f665847e0663c9f41

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